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SL all the way. Been in both and I am a big dude. 6'4" 250. The SL compares to a viper speed/power wise, but drives like how a merc drives. 110 and its smooth and still fairly quiet. The SL 350 is fun to drive, but the 55 is obviously the nicer car. Honestly I would consider a Nissan 350Z roadster over a 350. I know it's not a "merc" but it sounds like the name isn't that big of a deal to you.
I fit in the SL55, it's a beautiful car inside and out. If you got the $ treat yourself.
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